Web or sheet cutting mechanism for printing machines



H. DAVIS Oct. 2,1934.

I WEB OR SHEET CUTTING MECHANISM FOR PRINTING MACHINES Filed April 8, 1933 2 Sheets-Sheet 1|.l

Q s mm. N, A /g H. DAVIS Oct. 2, 1934.

WEB OR SHEET CUTTING MECHANISM FOR PRINTING MACHINES 2 sheets-sheet' 2 Filed April 8, 1933 .nm F

Patented Oct. 2, 1934 UNITED .srArE's lwrialrrY Fries. v -Lvwrsoy Y l WEB oitsnEEroUtrTlNGivrEoHANlsM Foa 'l L rnIN'rING MACHINES' Harry Davs,vSt. Albans, NJY., assigner to Irving Trust Company, temporary trustee for R. Hoe Y 8aV Co., Inc., New York, N. Y., lacorporation of New York 1 Application Api-i1 s, 1933,'seria1 No; 665,096VV 11.,.o1aims. `(ol. L164-661) nThis invention relates in general `to-,welofor sheet cutting mechanism for use in connection with cutting and` folding cylinders of rotary printing machines, having for its principal ob- '5 ject the provision of a knife box assembly with novel spring means for resilientlysupporting the cheek blocks. v

I It is Aalso an object of the invention to provide a knife box assembly of generally improved construction, whereby the device -will be simple, durable and inexpensive in construction, as well as convenient, practical, serviceable and efficient in its use. Y

With the foregoing and other objects in View, 1.52 which will appear as the description proceeds,

the invention resides. in the combination and arrangementof parts, and in theY details of construction hereinafter described and claimed.

The preferred embodiment of 4theinvention is illustrated in thev accompanying drawings,

wherein:

Figure 1 is a diagrammatic View of embodiment of the invention operatively applied to a cutting cylinder; Y. fi Figure 2 is a longitudinal .sectional .vien/of one half ofthe knife boxv assembly, partly kinelevaf tion, with parts broken'away Figure 3 is an elevational viewof the ksame portion of the assembly as that shown in Figure j 2, taken on the linejand looking in thev direction of the arrow 3 of Figure 6"a,.portion vof (the knife blade beingr broken away to show ther'nan-` ner in which'the leaf springs and cheek blocks are mounted;

'- Figure 4 is a side elevationalrview ,offthellsarnef half of the assembly disclosed in Figures '27,and'

3, as seen in the direction of the arrow 4-'of AFigure 6, certain parts beingy broken,away' toishow the relation of other parts;

V vFigure 5 is atransverse sectional view-taken on the line andas yseen inthe direction ofthe arrow V,5 of. Figure 4;

Figure 6 is a view similar to Figure 5, takeno'n the line and as seen in the direction'ofthe arrow 6 ofFigure 4;V and flat strips upon pairs of whichthe cheek Yblocks are mounted. i

With more particulary reference to the. `drawj.

Figure 7 is a plan viewy of one of .theV leaves orl extensions asat 13 forsecuring the said knife box in operative position within the chamberof a cutting cylinder in accordance with convene' tional practice. Between the said plates, 11'-12 which are normally arranged in aligned position 69.1: and clampingly secured together by screws V14, aV cutting blade 15 is arranged, the headsA of the screws 14 being countersunk in pockets 16 formed in the member 11 and vhaving stems passing through cut out portions 14' in the blade 15. 65

The cutting blade 15 is secured between the members 11'-12 and extends upwardly between aA pair of cheek blocks 1'7-18 respectively, each cheek block consisting of a plurality of individual blocks or sections,arrangedY longitudinally, end to end, and seated on a pluralityv of springs, which latter asset forth hereinafter., .form an important feature of the present invention. Each pair of springs consist of an upper or outer leaf 19 and a lower vor inner leaf 21 whichV are arranged1 vin 7451i opposed relation, each leaf being formed, as best shown in Figure 7,` with anv ear orprojection`22. The member 11, as best shown -in Figures 5%6, is provided with al longitudinally lextending shal- 'loW recess 2,3, positioned between an upwardly s0` and lower leaves 19,21 of the above mentioned springs aremaintainedin positionby adjacent v portions'of the walls v2427 andthe projecting lips or ridges 25, ,2,8 respectivelyof the members 11, 12v andthe cheek blocks, 17,18, the `ears 22A of the said leaves 19, 21 being received in notches 31, 32 provided inthe ridges .25, 28, thus preventing displacement for longitudinal movement vof the said springs and securing them rmly in operative position for resiliently' supporting the cheek blocks. Slots'33 are provided in each of the cheek blocks, thesaid slotsa'commodating pins 34, 35secured 100 on the vertical extensionsv24, 27 of I-the members 11,"12 thus permitting the said cheek Yblocks to move in a vertical plane within the limits of the said slots. The pins 34, 35 project through the heekblocks to a point adjacent either side-ofthey 105 knife'f15.- Y Means are providedA for adjusting the knife blade 15 in"'avertical plane. AThev saidnmeansconsisting of .screws 36, located at either end of the` member. 12, and threadedly Vengaged in a 110 shelf 37 formed as a portion of the member 12, the said screws 36 having enlarged heads 38 which are received in slots or cut portions 39 formed in the lower portion of the cutting blade 15. The bottom edge of the blade 15 is also engaged by an adjacent inner portion of the heads of a series of other screws Lil which are also threadedly engaged in the shelf 37 and which serve to brace the blade 15 in the adjusted position selected, as best shown in Figure 5.

The knife box assembly A is adapted for insertion into any conventional type of cutting cylinder such as that illustrated in Figure 1, and isA secured thereto by screws (not shown) passed through the apertured extensions 13 into the body of the cutting cylinder. A cutting abutment 43 arranged on a folding cylinder 44vcoacts 1 with the knife blade l5 in severing the web 45 engaged between the nip of the folding and cutting cylinders, as the said cylinders rotate.

When desired or necessary, the above-described knife box assembly may be quickly taken apart for inspection of the various elements thereof by merely unthreading the screws 14.

Heretofore, considerable diilculty has been experienced in helical type springs used to support the cheek blocks by reason of the limited space available in the interior of the knife box, necessitating the use of comparatively short springs which did not provide sufficient resiliency to properly maintain the cheek blocks in operative position. In addition the said helical springs are quite prone to break in use. These operating disadvantages have been in large measure overcome by the leaf type springs hereinbefore described which are particularly adapted not only to be received into a comparatively restricted passageway, but also, by reason of their design and construction and their engagement with the coacting adjacent parts of the knife box, to be held securely against displacement while maintaining the cheek blocks in operative position with a uniform pressure.

It will be understood that the invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it is therefore desired that the present embodiment be considered in all respects as illustrative and not restrictive, reference being had to the appended claims rather than to the foregoing description to indicate the scope of the invention.

What I claim is:

1. A knife box of the character described comprising a plurality of cheek blocks, means for securing said cheek blocks in operative relation, a knife arranged between the cheek blocks, and

leaf Vsprings for resiliently maintaining the said Y knife arranged between the cheek blocks, and 'i non-helical means for resiliently supporting the said cheek blocks, said non-helical means comprising outer and inner sections arranged in opposed relation.

3. A knife box assembly of the characterde-v v scribed comprising cheek blocks, means for se-t curing the cheek blocks in aligned relation, aV knife blade secured in said means and extended upwardly between the cheek blocks, a plurality of threaded means for adjusting the knife blade,

and a plurality of pairs of leaf springs arranged on either side of said knife and positioned between the cheek blocks and the means, each of said pairs of leaf springs comprising an outer Section and an inner section, said sections being arranged inopposed relation. l

4. A knife box assembly of the character described comprising a pair of members arranged side by side, a pair of cheek blocks secured between said members, a knife blade adjustably secured between the members and extending upwardly between the cheek blocks, means formed in said cheek block and said means for firmly securing a plurality of pairs of leaf springs therebetween, and other means for preventing longitudinal movement of the leaf springs relatively to the said members and cheek blocks.

5. In a device -of the character described, a pair of members arranged side by side, a pair of cheek blocks secured to said members, a knife blade adjustably mounted betweenmembers and extended-upwardly between the cheek blocks, a pair of threaded members for raising and lowering the knife blade, a plurality of other threaded members for bracing the knife blade, leaf springs arranged between the cheek blocks and the members, and means formed in the said leaf springs for restraining same from longitudinal movement relatively to the cheek blocks and the first men tioned pair of members.

6. A knife box of the kind described comprising a pair of members arranged in juxtaposed relation, a recess provided between said members, flat springs secured in the recess and seated on said members, a cutting blade positioned between the cheek blocks and the members and slidable relatively thereto, a plurality of threaded means for moving said cutting blade relatively to said member and cheek blocks, and other means integral with said springs for anchoring same in operative position.

7. A device of the kind described comprising a pair of members arranged in aligned relation, recesses formed in said members, a plurality of non-helical springs arranged in said recesses in pairs, each pair having an outer sectionand an inner section, a pair of cheek blocks arranged in the recesses and seated on said sp-rings, guide means arranged on said cheek blocks and said members for maintaining said springs in operative aligned relation, a cutting blade secured between said cheek blocks and members, a plurality of screws adapted to engage a lower edge of said cutting blade for adjusting same relatively to said members, and instrumentalities for anchoring said springs against translational movement within said device. V 8. A device of the kind described comprising a pair of members arranged in alignedrelation, a plurality of means for securing the members in said aligned relation, a cutting blade positioned between said members, a cheek block arranged on either side of the blade, a plurality of nonhelical resilient means engaging opposed surf-aces of the cheek blocks and members, and means threadedly engaged in one of the plates for raising and lowering the cutting blade relatively to the cheek blocks and the said members, said resilient means` including springs arranged in pairs, each pair comprising an outer leaf and ank inner leaf.

9. In a cutting mechanism for a printing machine folder, a rotary carrier having a recess, a knife secured in the recess, cheek blocks on either side of the knife, and flat springs between the cheek blocks and the bottom of the recess, wherefoo los

11. In a cutting mechanism for a printing machine folder, a rotary carrier having a recess, a knife secured in the recess, cheek blocks on either side of the knife supported to move only in a plane substantially radial to the axis of the carrier, at springs in the bottom of the recess, means for securing them to resist longitudinal motion, other iiat springs in the recess engaging the first springs, and means to secure said last mentioned springs to the cheek blocks to resist longitudinal motion.

HARRY DAVIS. 

